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While this compound contains a transition element, this metal forms only one type of ion. Thus a Roman numeral is not used in the name of this compound.

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Your choice indicates a polyatomic ion. However, this compound doesn't contain negatively charged polyatomic ion.

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The prefixes mono-, di-, tri-, tetra-, are used only with covalent compounds, and this compound is ionic.

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Your choice indicates a polyatomic ion that is not found in this compound.

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